* {
    margin: 0;
    padding: 0;
}
.container {
    height: 100vh;
    width: 100vw;
    background: rebeccapurple;
    background: url(../images/bg.jpg);

}

.content {
    float: left;
    height: 500px;
    width: 100%;
    margin: 0 auto;
    margin-top: calc(100vh / 2 - 250px );
}
.content .login_box {
    height: 100%;
    width: 600px;
    margin: 0 auto;
    background: white;
}
.login_box .login_title {
    font-size: 24px;
    font-weight: 600;
    text-align: center;
    line-height: 60px;
}
.login_box .input_item {
    width: 100%;
    height: 60px;
}
.login_box .item_lable, .item_content {
    float: left;
}

.login_box .item_lable {
    width: 100px;
    text-align: right;
    padding-right: 5px;
    line-height: 40px;
}
.login_box .item_content {
    width: 280px;
    line-height: 40px;
}
.login_box .item_content input {
    height: 40px;
    width: 200px;
    /* border: none;
    background: transparent;
    border-bottom: turquoise; */
}
.input_item input[type="button"] {
    width: 100px;
    height: 35px;
}
.input_valid {
    font-size: 12px;
    color: yellowgreen;
    display: none;
}

.input_invalid {
    font-size: 12px;
    color: red;
    display: none;
}